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Sega Master System II Motherboard Replacement

Introduction

In this guide I'll show you how to disassemble the motherboard of the Sega Master System II.

What you need

  1. Sega Master System II Motherboard Replacement, Outer Case: step 1, image 1 of 1

    • Flip the console on its back and unscrew the 5 screws marked on this photo.

    Edit

  2. Sega Master System II Motherboard Replacement: step 2, image 1 of 1

    • Once you've unscrewed those 5 screws, flip the console upright again.

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  3. Sega Master System II Motherboard Replacement: step 3, image 1 of 2 Sega Master System II Motherboard Replacement: step 3, image 2 of 2

    • Once the console is upright, first gently pull the rear of the top up.

    • After the top is at an angle, gently remove it by pulling upwards.

    • Note: Be very careful! The top has 2 tabs connecting it with the bottom half, those are in the vincinity of the 2 controller ports! (marked yellow)

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  5. Sega Master System II Motherboard Replacement: step 4, image 1 of 1

    • Once the 2 halves are separated, it should look something like this.

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  6. Sega Master System II Motherboard Replacement, Motherboard: step 5, image 1 of 1

    • Next step is the removal of the RF shield.

    • There are 7 screws in total, please unscrew those.

    • The blue marked screw is shorten than the other 6 screws, this screw has to be put back in the exact same location during reassembly.

    • Note: Tab marked in yellow!

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  7. Sega Master System II Motherboard Replacement: step 6, image 1 of 1

    • Carefully lift the RF shield up, left side first.

    • See the note in the previous step.

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  8. Sega Master System II Motherboard Replacement: step 7, image 1 of 2 Sega Master System II Motherboard Replacement: step 7, image 2 of 2

    • Now we have a complete view of the motherboard, thus coming to the last step.

    • For this step you only need to remove 3 remaining screws.

    • 2 screws on the connector.

    • There's 1 shorter screw as previously with the RF shield. This small screw keeps the voltage regulator in place.

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  9. Sega Master System II Motherboard Replacement: step 8, image 1 of 1

    • When you've disassembled everything, it should look like this.

    • Once you've got the replacement board, just follow this guide in reverse order.

    Edit
Conclusion

To reassemble your device, follow these instructions in reverse order.

One other person completed this guide.

Author

with 2 other contributors

Arjan Kuiper

Member since: 04/20/16

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